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06-13-2017, 10:04 PM
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#1 |
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Registered User
Join Date: Jan 2013
Location: Columbia, SC
Posts: 1,926
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Low compression #6 cylinder
I'm looking for suggestions. I don't have any history on this engine.
I have a 1971 250ci in a 1963 C10. Runs pretty well in the shop. Truck isn't quite roadworthy. Anyway, cold compression test today had me smiling until #6 cylinder tested low. Here are the numbers. #1 through #5 = 125 #6 was around 90 Please review my plan. Next is a wet compression test while cold. Then a hot compression test. Then I'll check valve lash if necessary. The engine is a little noisy but I used a hose to listen while running and it didn't seem to come from the lifters.
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My 65 C10 build: www.lugnutz65chevystepside.weebly.com Want to know more about T5 transmissions? My website has a T5 Info Page and a Step by Step T5 rebuild. |
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06-22-2017, 04:13 PM
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#2 |
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One of the First
 
Join Date: Jan 2000
Location: St. Augustine,FL.
Posts: 4,049
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Re: Low compression #6 cylinder
You need to figure out of its leaking out the bottom end (rings) or top end (valves). Next test: leakdown test. I would research and determine if you can accomplish this.
__________________
DAVID PASSMORE ST AUGUSTINE ,FL ZIP 32084 '71 SWB K/10 CUSTOM DELUXE (Chili) '72 BLAZER K/5 Muscle Truck (Mule) '72 LWB K/20 CHEYENNE (Blackie) |
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